This is useful to detect a barebox image and to be able
to copy only the image size if barebox is stored on
raw partitions which are bigger than the image.
Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
---
arch/arm/cpu/start.c | 6 ++++++
arch/arm/lib/barebox.lds.S | 1 +
include/asm-generic/sections.h | 3 +++
3 files changed, 10 insertions(+), 0 deletions(-)
diff --git a/arch/arm/cpu/start.c b/arch/arm/cpu/start.c
index e0fb712..ddb65e8 100644
--- a/arch/arm/cpu/start.c
+++ b/arch/arm/cpu/start.c
@@ -38,6 +38,12 @@ void __naked __section(.text_entry) exception_vectors(void)
"ldr pc, =not_used\n" /* (reserved) */
"ldr pc, =irq\n" /* irq (interrupt) */
"ldr pc, =fiq\n" /* fiq (fast interrupt) */
+ ".word 0x65726162\n" /* 'BARE' */
+ ".word 0x00786f62\n" /* 'BOX' */
+ ".word _text\n" /* text base. If copied there,
+ * barebox can skip relocation
+ */
+ ".word _barebox_image_size\n" /* image size to copy */
);
}
diff --git a/arch/arm/lib/barebox.lds.S b/arch/arm/lib/barebox.lds.S
index 7683f73..81a9123 100644
--- a/arch/arm/lib/barebox.lds.S
+++ b/arch/arm/lib/barebox.lds.S
@@ -93,4 +93,5 @@ SECTIONS
.bss : { *(.bss*) }
__bss_stop = .;
_end = .;
+ _barebox_image_size = __bss_start - _text;
}
diff --git a/include/asm-generic/sections.h b/include/asm-generic/sections.h
index c5d60a9..1f48fb8 100644
--- a/include/asm-generic/sections.h
+++ b/include/asm-generic/sections.h
@@ -4,5 +4,8 @@
extern char _text[], _stext[], _etext[];
extern char __bss_start[], __bss_stop[];
extern char _end[];
+extern void *_barebox_image_size;
+
+#define barebox_image_size (unsigned int)&_barebox_image_size
#endif /* _ASM_GENERIC_SECTIONS_H_ */
--
1.7.2.3
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